In the constellation of Taurus, a star is exploding. The explosion began with a supernova
almost a thousand years ago, and the resulting nebula, the Crab Nebula, is continuing to
expand at more than 1,000 km per second. It is home to a powerful pulsar.

The pulsar that lies at the heart of the Crab Nebula. This is
the remnant of the star whose supernova created the
nebula nearly a thousand years ago. As it spins rapidly on its axis, the
pulsar sends shockwaves out through the nebula.